This was not in my list of games to rate, but it's great enough to warrant my vote. You did an awesome job coming up with puzzles and hiding things in unique and interesting places. The difficulty was just right - quite challenging, even frustrating at times (but only because of the player's failing) - but just enough that I was eager to beat it. The art was very impressive for 48 hours, obviously you have had some experience with pixel art. My three criticisms would be the lack of sound (understandable though missed), the mediocre ending (also understandable due to time), and the difficulty of climbing ladders. Ladders could be improved I feel by allowing the player if grab them if they are holding up when they near a ladder, rather than only if the press up at the exact moment they cross it.
All in all, excellent entry! As of yet, I haven't played another entry which I would want to win more than yours!
P.S. I'd love to see a Post-Mortem from you!